.travis.yml in twilio-ruby-3.12.3 vs .travis.yml in twilio-ruby-3.13.0

@@ -5,21 +5,18 @@
   - ruby-head
   - ruby
   - 2.1.0
   - 2.0.0
   - 1.9.3
-  - 1.8.7
   - jruby-head
   - jruby
   - jruby-19mode
-  - jruby-18mode
   - rbx-head
   - rbx-2
-  - ree
 matrix:
   fast_finish: true
   allow_failures:
     - rvm: ruby-head
     - rvm: ruby
     - rvm: jruby-head
     - rvm: jruby
-    - rvm: rbx-head
\ No newline at end of file
+    - rvm: rbx-head